Obedient, obese, oblique, obscure observant, obsolete and obvious are adjectives that begin with the letter O. Additional adjectives include official, old, Olympic, open, operable, oriental, outback and outrageous.
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Lions can be described as overpowering. The word starts with the letter o.
thought = noun; thoughtful = adj; thoughtless= adj, thinking = adj, thinker = noun.
Overalls
ottoman
Orang-utan is a type of rainforest animal that starts with an 'o' at the start of it's name.